A number x is double another number y. Their difrence is 4.

What are the two numbers. And if you could how did u get the answer?

x is two times another number y is the same as saying x=2y. The difference of x and y is 4 is the same as saying x-y=4.

Now plug x=2y into x-y=4 to get 2y-y=4. Solve for y to get y=4. Now plug y=4 back into x=2y to get x=8.

Those two mysterious numbers are x=8 and y=4. BOOM! you got your answer.

x = 2y
x - y = 4
solve the system of equations:
2y - y = 4
y = 4
x = 2(4) = 8

x = 2*y
x -y = 4

2y - y = 4
y = 4
x = 8

X=8 Y=4 y+y=x x-y=4